tracing linen

例句：

1. 1.The detective was tracing the movements of a suspect.
   侦探正在追踪嫌疑人的行动。
2. 2.She traced her steps back to the scene of the crime.
   她追溯自己的足迹，回到了犯罪现场。
3. 3. The scientist used a microscope to trace the DNA sequence.
   科学家使用显微镜来追踪DNA序列。